Fred Kovaleski's son, Serge, wrote a thrilling account of how Fred's career as a spy incorporated tennis in a useful way. Click here to read the story.
Acclaimed novelist David Foster Wallace, a suicide in 2008 at age 46, published two lengthy pieces on professional tennis players that are worth reading. Click here to read about Michael Joyce and here to read about Roger Federer and here for a 2017 follow-up to Joyce written by Sam Riches.
Here's a worthwhile Sports Illustrated article from 1986 that's always worth a look. The featured players have all passed on.
Have a look at Paul Fein's article about the ATP's consideration of eliminating service lets. Included are comments by several dozen prominent players (almost all opposed).